Daylight lamp



N. LANG.

DAYLIGHT LAMP.

APPLICATION FILED APR. 21,192I.

Patented Aug. 22, 1922.

2 SHEETS$HE ET I l I I F35. grim INVENTOR /Vfc Z5 Lang.

. LANG.

DAYLIGHT LAIVIP. APPLICATION FIL'ED APR-21, 1921.

Patented Aug. 22, 1922.

2 SHEETS-SHEET 2.

INVENTOR /%l.rja,vy

ATTORNEYS 'NIELS LANG, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

DAYLIG-HT Specification of Letters Patent.

Patented Aug. 22, 1922.

Application filed April 21, 1921. Serial No. 463,131.

1 0 all whom it may concern Be it known that I, NIELS LANG, citizen of the Dominion ofO'anada, residing at Vancouver, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Daylight Lamps, of which the following is a specification.

This invention relates to an electric lighting fixture having provision in the light refleeting means for. modifying the colour character of the light as emitted from an incandescent lamp.

An incandescent lamp, the bulb of which is charged with an inert gas, such as nitrogen, emits a light which is richer than/sunlight in the red-orange and yellow qua/lities,

but is deficient in blue rays. To correct this I introduce within the bowl of the fixture a silvered reflector of blue-tinted glass sufiicient to deliver from the bowl of the fixture a light closely resembling that of clear daylight.

The means by which this is attained. is fully described in the following specification, reference being made to the drawings by which it is accomplished, in which:

Fig. 1 is a .vertical section through the light fixture showing the disposition, of the reflector and bowl in relation'tothe lamp.

Figs. 2 and 3 are inverted plans of the reflector showing the disposition of the coloured glass therein, and

Fig. 4 is a vertical sectionof a modified form of thefixture. I

In these-drawings 2 represents the bulb of an incandescent lamp charged with an inert gas, such as nitrogen; 3 represents the canopy, 4 the cornice and 5 the bowl of the fixture. 4

Supported within the cornice 4 of the fixture and above the lamp 2 is a reflector 6 of silvered glass, the glass of which is colourtinted to modify the light of the lamp as delivered through the bowl 5 to what is desired. Thus, if, as stated, the light of the lamp 2 is deficient in the blue characteristics, the glass of the reflector 6 is blue-tinted thus modifying the light of the lamp by eliminating the excess of red and yellow rays.

As only a proportion of the light of the lamp 2 falls on the reflector 6 and the entire lightof the lamp requires to be modified, the colour tint of the glass of-the reflector should be sufiicient to modify the the desired result, the essential feature of the invention being the use in a fixture of this class of colour tinted silvered glass applied as a reflector.

Figure 4 shows a modification of "the invention wherein the reflector 6 has a skirt 7 of similar silvered glass, colour tinted, projecting angularly downward from its outer edge, which skirtu7 may be integral with the reflector 6 or may be connected thereto in a series of planes, or in segments of a conical surface. v

Where this skirt 7 is used the bowl 5 is preferably as shown in the drawing provided with a border or brim' 8 extending under .the skirt 7, the surface of which brim may be in a horizontally disposed plane or may form part of a flattened cone. This brim 8 may be of clear glass ridged or roughened to break up the light rays, while the bowl portion 5 may be of semi-opaque or frosted glass. With this disposition the colour tinted light as reflected from the skirt 7 is substantially all delivered through the brim 8 to modify outside the bowl 5 that delivered through the bowl itself.

This system confers many advantages beyond the'mere modification of the light to what is required, as by using colour-tinted glass in the reflector, the eifectxis consider-. ably in excess of what it would be were the light passed through a colour-tinted bowl, as in the reflector the light not only passes through the glass to the silvered back but is reflected back from the silvering to pass again through the glass.

Further, any desired modification can be more readily attained where it is effected in the glass of the reflector, for, as pointed .out in the specification, the" reflector may be built up of separate pieces of various colour-tinted or clear glass to obtain the desired result; whereas otherwise local manufacturers of lighting fixtures would be entirely dependent on standarized tints in the glass of the bowl without any satisfactory means of varying the tint to meet any particular requirement, such as the Work for which the light is required, or the colour scheme of a room.-

I do not desire to be confined to the'particular forms'of refiectoror of bowl hereinbefore described and illustrated, as the reflector, instead of being a substantially plane surface may. be concave or convex to concentrate or disperse the light as desired, or the surfaces may be made up of a series of planes disposed in a general conical form.

Having now particularly described myinvention, I hereby declare that what I claim as new and desire to be protected in by Letters Patent, is:

1. An electric lighting fixture, the comof silvered glass, which is color tinted to modify the character of the light passing through it to and from the reflecting sur-\ face.

2. In an at zctric lighting fixture, the com- .bination with the lamp bulb, of a silvered glass reflector of colour-tinted glass, said reflector having a skirt angularly projecting downwardv "from its outer edge, which skirt is also made of colour-tinted glasssilvered, and a bowl beneath the reflector having a brim projecting under the skirt.

In testimony whereof I affix my signature.

' NIELS LANG. 

